如何选择一张图片来设置头像

Question

我有一个应用程序，用户可以通过自己设置一张图片或从图库中选择一张图片来设置自己的头像。我在其他应用程序中看到，用户在选择图像后会显示一个视图，用户可以在其中“绘制”一个矩形，选择他想用作头像的图像区域。 我想在我的应用程序中包含这种可能性。拍完照后怎样才能做到这一点？

谢谢！

编辑：

我想这个做，但它打开图片库，而不是相机：

Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
      cameraIntent.setType("image/*"); 
      cameraIntent.putExtra("crop", "true"); 
      cameraIntent.putExtra("scale", "true"); 
      cameraIntent.putExtra("outputX", 100); 
      cameraIntent.putExtra("outputY", 100); 
      cameraIntent.putExtra("aspectX", 1); 
      cameraIntent.putExtra("aspectY", 1); 
      cameraIntent.putExtra("max-width", 30); 
      cameraIntent.putExtra("max-height", 30); 
      cameraIntent.setAction(Intent.ACTION_GET_CONTENT); 

      startActivityForResult(cameraIntent, IMAGEN_CAMARA);  

Answer 1

这是我是如何实现它在我的应用程序之一，使用这一功能。这很简单。

private void doTakePhotoAction() { 
// http://2009.hfoss.org/Tutorial:Camera_and_Gallery_Demo 
// http://stackoverflow.com/questions/1050297/how-to-get-the-url-of-the-captured-image 
// http://www.damonkohler.com/2009/02/android-recipes.html 
// http://www.firstclown.us/tag/android/ 
// The one I used to get everything working: http://groups.google.com/group/android-developers/msg/2ab62c12ee99ba30 

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 

//Wysie_Soh: Create path for temp file 
mImageCaptureUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(), 
        "tmp_contact_" + String.valueOf(System.currentTimeMillis()) + ".jpg")); 

intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri); 

try { 
    intent.putExtra("return-data", true); 
    startActivityForResult(intent, PICK_FROM_CAMERA); 
} catch (ActivityNotFoundException e) { 
    //Do nothing for now 
} 
} 

protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
if (resultCode != RESULT_OK) { 
    return; 
} 

switch (requestCode) { 

case CROP_FROM_CAMERA: { 
    //Wysie_Soh: After a picture is taken, it will go to PICK_FROM_CAMERA, which will then come here 
    //after the image is cropped. 

    final Bundle extras = data.getExtras(); 

    if (extras != null) { 
     Bitmap photo = extras.getParcelable("data"); 

     mPhoto = photo; 
     mPhotoChanged = true; 
     mPhotoImageView.setImageBitmap(photo); 
     setPhotoPresent(true); 
    } 

    //Wysie_Soh: Delete the temporary file       
    File f = new File(mImageCaptureUri.getPath());    
    if (f.exists()) { 
     f.delete(); 
    } 

    InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
    mgr.showSoftInput(mPhotoImageView, InputMethodManager.SHOW_IMPLICIT); 

    break; 
} 

case PICK_FROM_CAMERA: { 
    //After an image is taken and saved to the location of mImageCaptureUri, come here 
    //and load the crop editor, with the necessary parameters (96x96, 1:1 ratio) 

    Intent intent = new Intent("com.android.camera.action.CROP"); 
    intent.setClassName("com.android.camera", "com.android.camera.CropImage"); 

    intent.setData(mImageCaptureUri); 
    intent.putExtra("outputX", 96); 
    intent.putExtra("outputY", 96); 
    intent.putExtra("aspectX", 1); 
    intent.putExtra("aspectY", 1); 
    intent.putExtra("scale", true); 
    intent.putExtra("return-data", true);    
    startActivityForResult(intent, CROP_FROM_CAMERA); 

    break; 

} 
} 

}

希望它能帮助:)